Multiangular clamp for glass panels or the like



Jli- 1954 R. N. YGHERSIN ElAL 2,667,245

MULTIANGULAR CLAMP FOR GLASS PANELS OR THE LIKE Filed April 5, 1953 5 Sheets-Sheet l IN NTORS GEORGE L. amass BYE/IA PH xv. GHEfiS/A/ ATTORNEY Jan. 26, 1954 R. N. GHERSIN ETAL MULTIANGULAR CLAMP FOR GLASS PANELS OR THE LIKE 5 Sheets-Sheet Filed April 3, 1953 INVENTORS GEORGE L. BRIGGS R41 PH N. Gfiffi'J/N ATTO R N EY Jan. 26, 1954 R. N. GHERSIN ETAL MULTIANGULAR CLAMP FOR GLASS PANELS'OR THE LIKE 5 Sheets-Sheet 3 Filed April 5,' 1953 GEORGE .4. 59/666 lPfllP/w /V. Gl/EFS/A/ BY Ma /W ATTORNEY Jan. 26, 1954 R. N. GHERSIN ETAL 2,667,246

MULTIANGULAR CLAMP FOR GLASS PANELS OR THE LIKE Filed April 5, 1953 5 Sheets-Sheet 4 X INVENTbRS GEO/P65 4. 50/665 BY W ATTOIQEY 1954 R. N. GHERSIN ElAL 2,667,246

MULTIANGULAR CLAMP FOR GLASS PANELS OR THE LIKE Filed April 5, 1953 5 Sheets-Sheet 5 INVENTORS WWII GfOfiUE 4. amass 7941 M Gl/fFJ/fi/ BY ATTORNEY Patented Jan. 26, 1954 2,667,246 MULTTANGUL R CLAMP FOR'GLASS PANELS OR THE LIKE Ralph N. Ghersin and George L. Briggs,

White Plains, Y.

' Application April 3, 1953, Serial No. 346,704

40 Claims. (Cl. 189-...78)

This invention relates to constructions for securing or clampingtogether, at spaced intervals along their line of substantial edge-'toeedge contact, of glass plates,such as the glass plates or panels of store fronts, show-cases, and the like, where a wide or substantial range of angularities between adjacent glass plates or panel are met with.

One of the objects of this invention is to provide a neat, compact and strong device for securing glass plates together in substantially edgeto-edge contact and dependably hold the glass plates at their intended-angle. Another object is to provide a device of the just-mentioned character constructed and operating so as to be readily and dependably set or self-accommodating to a wide range of angles between the plates to be held in edge-to-edge assembly. Another object is to provide a relatively diminutive clamping device of the above-mentioned nature that will be capable of ease and facility of adjustment or selfacoommodation to various angularities between the glass plates and yet provide, throughout its range of angular accommodation, a rigid angularity in its securing action as will reliably resist tendencies of one glass plate to pivot relative to the other about the line or plane of edge-to-edge engagement of the plates.

Another object is to provide a composite device for conjointly clamping, at spaced intervals along the line of their edge-to-edge engagement, two glass plates or panels to hold them relatively rigidly at the desired angularity and capable of functioning to provide such relative rigidity of angularity throughout a substantial range of different angles met with in practice. Another object is to provide a device of the just-mentioned nature that will be simple and easy to set or accommodate to various angularities between the glass panels and that can be readily and inexpensively installed or applied, at spaced intervals as aforesaid, in installing glass plates or panels at various angularities therebetween according to the particular requirements or conditions met with in practice. Another object. is to provide a device of the just mentioned nature in which the various coacting clamping parts and other elements can be readily and inexpensively fabricated, with the parts so constructed as to assure simple and foolproof assembly asv well as implicity and ease of manipulation in installation.

Another object is to provide a device of the above-mentioned character that can be readily fabricated in forms of neat. and attractive appearance, unobtrusive in size, and thus aid in achieving high quality of appearance of the store front,'show case or the like, and yet be strong and dependable in its action in mechanically maintaining substantially rigid the selected one of a substantial range of angularities throughout which the device is capable of functioning in edge-to-edge mating relation.

Another object is in general to provide ime proved clamping devices for securing and holding, at their apex, angularly related glass. plates or panels; other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists inthe features of construction, combinations of elements, and arrangements of parts as will be exemplified in the structure to be hereinafter described and the scope of the application of which will. be indicated in the claims.

In the accompanying drawingain which are shown. several of the various possible embodiments of our invention andin which similar reference characters refer to similar parts through.- out the-several views, H V

Figure 1 is a small-scale front. perspective view of a clamping device shown in relation to, two glass plates or panels, showing the appearance and illustrating the functioning of thev device where the external angle made by the glass panels is greaterthan j I Figure 2 is a perspectivev view of the device and glass panels as seen from the rea of Figur 1;

Figure 3. is an exploded perspective viewshowing the severalparts and their interrelationships, of the device of Figures 1 and 2;

Figure, l isa plan view of one of the external or front clamping parts as seen alongthe line iwd of Figure 3,;

Figure *5 is a transverse sectional view een along the line 5-5 of Figure 4; V I

Figure 6 is a plan view seen along the line 6--6 of FieureB;

Figure 'Zis a plan viewas seen along the line la-7, of Figure 3 but showing the several parts nested, together to more clearly bring out certain features of assemblyand coaction in use;

Figure 8, is a perspective view of a sleeve type of wrench for manipulating or setting one of the parts of the clamping device;

Figure 9 is an exploded perspective view of the deviceof Figures 1-! showing certain coacting structural features that are preferably embodied therein when the threaded tension element or rodv made half round instead of round as in Figures 2 and 3;

, Figure 10 is a plan view as seen along the line Ill-4B, of Figure 9 but showing the several parts nested together to more clearly bring out cer- 3 tain features of assembly and coaction in use.

Figure 11 is a detached or fragmentary sectional view, on a larger scale, showing the relationship of certain of the nested parts of 1 Figure Figure 16 is a small-scale front perspective view like that shown in Figure 1, showing how the several illustrative forms other than that of Figures 1 and 3 appear when installed and in use;

Figure 17 is a small-scale perspective view like that of Figure 2 showing how the various embodiments that employ a half round threaded tension rod appear, as from the rear in Figure 16, when installed and in use;

Figure 18 is an exploded perspective view like that of Figure 9 showing another modified form of certain features of the clamping device;

Figure 19 is a plan view or elevation of one of the clamping parts as seen along the line Ill-l9 of Figure 18;

Figure 20 is an end elevation as seen along the line 29-20 of Figure 19;

Figure 21 is a plan view as seen along the line -22! of Figure 18 but showing certain of the parts nested together; 7

Figure 22 is a small-scale front perspective view like that of Figure 1 but showing another form of clamping device;

Figure 23 is a perspective view as seen from the rear of Figure 22;

Figure 24 is an exploded perspective view, showing the parts and their relationship, of the device of Figures 22 and 23;

Figure 25 is a small-scale plan View or elevation as seen along the line 25-25 of Figure 24, of a dual front clamping part;

Figure 26 is an enlarged cross-sectional view as seen along the line 26-46 of Figure 25;

Figure 27 is a plan view or elevation as seen along the line 2'I-2l of Figure 24, but showing certain parts nested together as in actual use;

Figure 28 is a plan view or elevation as seen along the line 28-28 of Figure 24, but showing the several parts nested together as in actual use;

Figure 29 is a detached plan view or elevation of the hollow fulcrum member, with certain parts thereof broken away, showing certain features which maybe embodied in the bottom part of the fulcrum for coaction in securing a round threaded tension rod thereto;

Figure 30 is a transverse central sectional view thereof as seenalong the axis YY, with a round tension rod assembled thereto;

Figure 31 is a detached plan view or elevation of the hollow fulcrum member, with certain parts thereof broken away, showing certain features which may be embodied in the bottom part of the fulcrum for coaction in securing a half-round threaded tension rod thereto; and

Figure 32 is a transverse central sectional view thereof as seen along the axis YY, with a half-round tension rod assembled thereto.

Figure 33 is a plan or elevation showing two glass panels making an external angle that is re-entrant and relatively small, on the order of showing how the devices of this invention can function to meet such a requirement and also one form of filler and cushioning element;

Figures 34 is a view like that of Figure 12, showing a modification thereof to function also at a small external re-entrant angle;

Figure 35 is a plan view or elevation of one of the clamping parts as seen along line 35-35 of Figure 34;

Figure 36 is a longitudinal sectional view thereof as seen along the line 36-36 of Figure 35;

, Figure 3'7 is a central vertical sectional view of the device of Figure 34 showing its parts in positions corresponding to one limit of setting of the angularity between the front clamping parts;

Figure 38 is a top view, in relation to Figure 33, of a protective or sealing member coacting with the panels and parts of the front clamping members;

Figure 39 is a front elevation thereof;

Figure 40 is a transverse section on line 40-40 of Figure 39, and

Figure 41 is an elevation of one end thereof.

As conducive to a clearer understanding of certain features of this invention it might be pointed out that in the construction of store fronts and the like large glass plates or panels are frequently set at angles to each other with the contiguous edges of the glass plates appropriately beveled or mitered to bring them into substantial edgeto-edge contact, frequently with a very small space between the edge faces, for the reception of a suitable cement or caulking compound, which, however, is to the eye substantially invisible; according to prior practice such installations meet with various limitations or disadvantages or handicaps. For example, such glass panels have to be secured in some manner at spaced points along the edge-to-edge junction so as not to obscure the all-glass visual effect of the angular junction, and frequently the angle or angles at which two glass plates can be set are limited by the fixed angularities of available clamping devices, and even at that any installational departure from a given available angularity in setting up the glass panels brings about detrimental stresses and strains when the clamping devices of fixed angularity are applied at the corner-like junction. With fixed-angled clamping devices the installer of angularly related glass panels has to carry in stock suitable quantities of differently angular clamping devices in order to meet limited variations in angles met with in practice. One of the dominant aims of this invention is to provide a clamping device capable of ready setting or adjusting to clamp edge-toedge panels at any angle within a wide range of angularities and still achieve rigidity of any selected angle so that, among other advantages, the installer need not be burdened, by a large stock of differently angular devices, as heretofore.

In the drawings are shown two glass plates A, B, set in substantially edge-to-edge contact at an angle to each other, as for a store front, showcase or the like, and from the viewpoint of appearance it is the outside or external angle, indicated at C in Figure 1, that is of principal importance, particularly from the viewpoint of appearance, and that external angle C is usually a large angle, leaving. an internal angle, ,indi-ii. cated at D in Figures land 2 that is usuallythe M I g ,4 smaller of the two, and, being; on the inside, is lly and a of less importance from the viewpoint of .apures l an d fj, pearance, though any elements. of the cla -n1ping s side wall 2 2 qsed, device exposed to view should nevertheless bel unobtrusive in appearance. Theses elative an? gles may vary throughout substantial ranges, as is later pointed out, and those shown in the draw: ings are of course only illustrative. I Whatever the angle, the, adjacent andusuallyvertical edges v of, the .two ,glass panels are desirably grojindi o shaped, as by beveling ormitering, to pres t parallel edge, faces E, F, which are paralli of angles to each other n v 5 1 a the, bisectorof the angle 'C and of the angl e D, l5 the axis. intersectlngatth cglnciden ax thus provid ng mating e-ima es Wh Q 'E. a e. J rth erp zfir a i i 5 t m s re practical purposes substantial jaceto -fa'ee; wa117 2 3., Projecting,'upwardly'an [inward abutment even though ininstallingthern ajslightl opposite sides ofthe'sidfwalli ZZ'ZQbem a spacing is provided en. fi esv i t-re mare" sa ons r e ezes'y fi er wii si'e z 724;." the juncture airtight weathertight, with anyao zs p i integrally formed with 'y'iiriariearsid suitable cement or caulking compound; in the wall 22. ,t f .v drawings the line or plane of junction, or abuit ment, indicated at J, maybe consideredtqbeh 013 toinclude such a. thin layer of cement or caulkingcompound where the latter is e np Atspacedintervals alongthe-apex or juncnon" clamping devices are employed, and in Figures 1 and 2, oneform or" suchclamping device is shown inperspective at one such spaced point along the apexiormed bythetwo angularlyv related glass 9 panels .A, B, and it is constructed so that its pairs of clamping elements, one pair for each glass panel, can be set, or. adjusted, whilemaintaining v rigidit of angularity, to any angle Within the preferably constructe dfto be. above noted range of change of the external be in t hejorrn or a lsta" angle C. r a ,1 .7 V v I veniently it is, intransver The clamping device comprises athreadedten- 5),,l concavo convegg giIt sion rod 213 which is to .pass through the junction lel inside and. outside fa J of the two glass panels A, B, and its lol' gitlld -v n ece 9i, i i iq P 1 nal axis is'to fall in the plane or line or" the ,biabout 180 xte tisee Ffig l jfi i sector of the external angleC and internal angle, l lp fa tia st g gh 3d 99 FS" D, and for this purpose there is ground into either. nd l tmt qn ,peingaquitiqnail e in r a by or both of the edge faces E, F a transverse recessv ERG 9 5 8 W3 whi h e ei f ly or groove of appropriate shape and-direction. e n n}? 57 L1 931 For example, the tension rod 26 may be of.round i a t flamers? .c ,i b;

cross-section, in which case a transverse half-. asci 129 the P of the from f cc of the circular groove is cut into each of the faces E, F, I .:P?' 1- r, 3 l

the two grooves together, when the glass panels siNP r 1 5, fi fi, l t 11b, int 11y. spa

therefrom, the member zl ha a gen 11 A, B are set in position, forming a round hole into which the threaded round stem neatly pass es thus aidingin substantially aligning the rod 253 with the above-mentioned bisector. Or, as is shown in Figure 1'7 of the drawings, the D g e mg fiat face in be rligfniil. the radius of curvatureof thein si de face of the ran-q 9 f a-slngle half P generall cylindrical w nzz'ert e'ruierueii iem g-move the edge p i P me W0 ber 2| so that,viewing"Figure'3, by substantially palates:- stfch as plate A m mgme ir: unending the two frontclampingdevice's 2E2] gmo-ve bang clpsed P by the uncut edge'iaCe their lower ends can beente'red intothe hollow of the companion glass panel W wh s ca of the fulcrum me'mberlZLT each on'on'e side of serve to key or hold the half-round rod 29'against' e i X of FigureTG and hence eachftb rotationab ut ts H :7, side of the upstand ing'te'nsionrod'20; urftiltheirj hat End Of the 1 5 9 9 94 3 1 lfi t respective rectangular holes 32 are brought. into, forwardlyiFigure 1) through the apex and along juxtabosition withithehoobsfiaped the bisector of the external e e b forme latter i be entered into'the holesand 50 lll ll le lzn l along 10 of the clampingfelemnt v e e d men ib d" r lt ir s y; therein one ofthe'hook 's'ha ed lug '24' lower end as seen in Figure 3, issecured, in any thus assembling the clamp-mg members! suitablelmanner, a relatively small hollow fill: the fulcrum member 2L V crum member 2| which, though coacting with The lugs 24, 25, coasting w thhfioiesfsrzs other parts about to be described, can be given th clamping parts 26, 21, aidfinalini r igthe twb an external shape that is pleasing or ornamen" clamping parts a ong'a'n d h xi Y Y f tal, illustratively and preferably shaped some: Figure 6, but coacting therewith arethe upsts'nag what likea truncated spheroid, presenting exging opposed parts 33, 34 of thel fulcrurn 'member' ternal curved or convexedsurfaces,assindicated 24, between which the in endslof the clamp; in perspective in Figure 1. It suggests, in ap- 7 ing parts 26, 21 are snugly receiv ed'bcaiis e of 7 the above-described relative proportioning of the radii. Such alinement of the clamping parts along and with the axis Y--Y, Figure 6, takes place throughout a substantial angle of swing of each clamping member in directions toward and away from parallelism with the tension rod itself, for example, from an almost upright position, as viewed in Figure 3, of each clamping member 26, 21, each to one side of the tension rod 20, to a position where each clamping member slants downwardly below a horizontal plane through the lugs 24', That gives each clamping member 26, 21 a range of swing of over 90 in a direction downwardly and outwardly from the tension rod 20, and in any position within that range of swing the members are held with their longitudinal axes always in the same vertical plane, a plane coincident with the axis Y-Y of the fulcrum member 2| (see Figure 6). Members 26, 21 can thus be accommodated to a wide range of angularity for angle D, as from somewhat less than 180 to about 315 or so.

The inner ends of the clamping members 26,

.21, when both of the latter are horizontal as viewed in Figure 3, terminate in close proximity to each other and almost contact each other to either side of the threaded tension rod 20, being provided with a slot-like arcuate cutout (see Figure 4) of a radius commensurate with the.

radius of the tension rod 20 so as to accommodate the latter therein as the parts 26, 21 assume various angular positions. Moreover, the inner ends of the two clamping members 26, 21, instead of being squared off, have their arcuate side walls cut ofl in a gradual curve or are as at 36, without disturbing the radius of curvature of the inner face 28, so as to provide a good seat for acam nut 31 threaded onto the threaded rod 20. Cam nut 31, asshown in Figure 3, is in effect a halfsphere, thereby providing a radius of curvature equal to the radius of curvature of the inner face 28 of the two clamping parts, and in its upper fiat face it is provided with a cross slot to receive the prongs 4| of a sleeve wrench 42 (see Figure 8) which can be sleeved onto the rod 20 to turn the cam nut 31 when setting the latter to set the front clamping parts 26, 21 to whatever is the external angle C formed by the glass plates A, B (Figure 1). The diameter of cam nut 31 is less than the space between the inner ends of the hooked lugs 24, 25 so that the latter will not interfere with downward movement and entry of the cam nut 31 into the fulcrum member 2i.

With the clamping parts 26, 21 hooked onto the lugs 24, 25 respectively of the fulcrum member'2 l threading the cam nut 31 downwardly enters it into and interfits it snugly with those portions of the clamping members that extend inwardly from the holes 32, causing those portions to serve as lever arms to set and fix the angularities of members 26, 21. The hemispherical cam face 38 of the cam nut 31 confines the opposed inwardly curved sides of the clamping parts 26, 21 between itself and the opposed upstanding parts 33, 34 of the hollow fulcrum' member 21 and thus these parts coact to prevent detrimental side sway or wobble of the two clamping parts, holding them with their longitudinal axes in the vertical plane through the axis YY of Figure '1. Moreover, to either side of each lug 24, 25 the upper edge of the circular side wall 2201' the fulcrum member 2| is curved in an upwardlyconcave sense, for example, at a radius slightly larger than the radius of curvature of the exa cam face 38 that has ternal face 29 of the clamping member, as shown at 4343 adjacent the lug 24 and at 44-44 adj acent the lug 25. The curved edges 43-43 form a fulcrum against which clamping part 26 rests and about which it may tilt and the curved edges 44-44 form a fulcrum against which the clamping part 21 rests and about which it may tilt, each throughout the range above described and under the control of their respective lever arm portions coacting with nut 31.

With the aid of sleeve wrench 42 cam nut 31 is rotated to the desired position downwardly into the hollow of the fulcrum member 2|, acting equally upon the adjacent inner end lever arm portions of the two clamping parts 26, 21 to give each the same angle of tilt relative to the axis of the tension member 20, with the sum of the two angles equal to the external angle C at which the glass panels A, B are set. An illustrative range of values for angle C may comp-rise from about to about 315. In so setting the equal angularities of the outer clamping parts 26, 21 under the control of the cam nut 31, the clamping members 26, 21 function in effect as levers of the first class, the cam nut simultaneously applying the setting force to each at the outer end of a lever arm that comprises that portion of the clamping member that projects from the fulcrum edge of the fulcrum member 2! towards the threaded tension rod 26; this is not only a force applied in equally setting the angles of the two clamping parts but also is in effect a holding or securing force that permits each clamping part 26, 21 to function as a rigid cantilever in so far as applying clamping action on the panels is concerned. Neither the angle between clamping part 26 and rod 20 nor the angle between the clamping part 21 and the rod 26 can be enlarged by force applied at the outermost ends of the clamping parts 26, 21, and with rod 26 under tension, as later set forth, the angle C to which the clamping parts 26, 21 are adjusted or set becomes a rigid angle as a whole and furthermore its two halves are likewise rigid.

With the parts 26, 46 and 21 thus assembled and adjusted relative to the fulcrum member 2| and the threaded rod 26, the rod 20 is entered through the ground or cut groove or grooves at the junction J, the rod moving along the bisector of the angle D and bringing the flat or plane edge faces of the outer clamping parts 26, 21 fiatwise against the outer faces of the glass panels A, Brespectively, as shown in Figure 1, the fixed angle subtended by the clamping parts 26, 21 neatly mating with the angle C formed by the outer faces of the glass plates, thus also neatly aligning the clamping parts 26, 21 crosswise of the apex of the edge-to-edge junction between the glass plates. The threaded tension rod 20 projects rearwardly of the two glass plates and along the bisector of the interior angle D, as shown in Figure 2, standing ready to have coacting clamping elements associated therewith.

These coacting clamping elements comprise a unitary clamping plate 45 that is relatively narrow and long, but preferably shorter than the over-all lengths of the two outer clamping parts 26, 21 and being of about the same width as the latter. Clamping plate 45 may be in the form of a stampingof suitably heavy sheet metal and is divided into two clamping parts 46, 41 by a centrally located hole 48 (Figures 2 and 3) through which the rod 26 may pass and along the transverse axis of which the flat stamped plate 45 may be manually bent to conform to the internal angle D, as shown in Figure 2 and al in Fi ure E le, h le ,6? bea tab enutline with. iq ll i 'ilb f whi h tw er a nfid a one he transversebi'sector of, theuplatev ($5, thus to providetWo'transverselyalinfid p rtions 55 453w facilitate bend- .ing. ofthe-plate alongjts transverse/central axis.

Having ,slippefil.,the bent plate A "onto the threadedrod 2 9 and into the'inside angleD, thus juxt posin the. in r al am ng p rt 4 ,1 .respectively to theouter olan ping parts 25,121, .with the glass plates. A, Brespectively therebe .tween, a s rong rigid arcuate yoke enib'er 50 is ,..s1ipped ontothe tension rod. 25, the' yoke' '53 hava ingawidth about equaltp that of' the bent" or ,,angled olamping plate 45 and presenting equal .,and opposed arm-like portions513 ,50 fforen easement respectively with thein'side' clarnping ,plates 46, 47 atsome distance from the apexfends ofrthe latter. Q-nto the free endof the threaded rod 29 is now threaded acIamping nutFI and it, z jsztightened .up to put therod 20in appropriate tension, thus stressing the outer clamping parts ,,2 6,,. 21 as a unitand the inside clamping parts .46, lfllas a ,unit, toward each other, to o lanip the glass panels A, B and f x and hold therh at'the angle W :i the outer clamping parts 26, 21"wer'e" initially, adjusted or se t that angle being the ex- ,,.,,te .nal,an le,g of Figure l. j t L In theresultantolamping action the 'olainping forces pl dlt the ut n clam in pa ts 26, ract thereon throughthe fulerurh edges 63- 33 for clampin ,hart and fulcrum edges 44-44 for theolarnping part j2;1,, ou t hecaus e the heinispherical camnutfil ,snugly nates, as above described, with the, eurvatures oi the inside races 28 of the .,elamping partsjhgl andat the innerends there- .of,,.the,two.quter clamping parts 2t, 23' function D virtually as rigid cantilevers making a fixed angle 1 with eachothe pand fixed angles with the thread- ..ed tension rodjfirunder the equalized stresses applied to the inside plates 45,41 by the halancing or equalizingyoke 5E, theinside orback clamping platesAE, 4l ar neatly and dependabiy pressed against ,the inside facesof the glass panels A, B

" hand held insubstantial parallelism with their re speotivelyjuxtaposed or jront clamping parts 26, 21. Al so, the equalizer k ep, whichhas a hole 59.in which the tension rod 2i? snuglybutfslid- I ablyflfits, can act through, its Q bo sed' armlike l LDarts 50%,,509, as a double acting brace tosteady thjnside end ofthe threadedrod 20 and aid in holdingit along the pisectd if e e gle .at.. whi,ch,the outer clamping Darts 26, 21 are wagainst stresses thatrnight tend to shift it out of coincidence, with the lbiseetor, Ih ese actions are .aided by therigidportions 45 and 45 (Figure 3) .-,whioh. connect, the two .back; plates 4 6 andhold themwinnice alignment with each other and ,-.against relativedisplacement The part 5O can thuseoaetin naintaining the rigidity of the an setby the carnnut 3] and the fulcrum edges as above described The device can be embodied in relatively d'iminutive "form; for example, the hollow-fulcrum z member 2] (Figures 1, 3 and Dean; have a diaml veter on theorder ofv of an inch the halffround I front clamping parts 26 2T.can have-an over-all ---.-Width.or.outside diameter somewhatjless, pteing ahout'the same-asor. a little less than the; inside i 38 of cam nut 31 is just about equal to the radius of the inside faces 28 of the clamping parts 26, 2! for snug interfitting with the inner endportions of the clamping parts. Thus, as is better 5' shown inFigure 7'; these various parts are snugly and neatly nested one Within another, making for avoidahc'eofundesirable looseness 'or play and "coactiiig to" reinforce one another mutually throughout the range of adjustment "or seating 10 "of'the parts according to the sizeof the external "angle C (Figure '1) and thus'providing a strongly 1 reinforced structure at whateverangle for which the io'a'rts are set. The construction, though I din'iiniitive; is strong, "the interactions of its parts making itin efieet self-reinforcing." Asappears 'froin' Figure'JI; the devioewhn installed makes a nee appearance, beingsy'mrnetrical about the apex 'ofth'e external angle '0, while the parts'on "theinside'as shown in Figure '2, are'also'relatively'ismall and are unobtrusive in appearance. InFigure 3 the threade'd'rod'ZQ is purposely shown fof 'eiiag'geratedlength inorderbetter to bringout the 'relatiohships' between the'various parts. The hollow fulcrum member'zf'may be fabricated "in any suitable "manner; for example, it may be made of sheet metal'by suitable s'tainping' and drawing operations;

Our in'ventionniay be carried "ou't'in other fo'rriis than the embodiment illustratively describedabov, and several such other possible forms are later herein described by wayof examples but not by Way of limitation;'moreover,all er thern'can be'carried outin practiceby'making Ythe threaded rod 20 half round, ashlready-suggested' above, where it is desired togain'the advantage 'of havihg'to c'ut"or grind atransverse half-"iiircularf groove'into" the edge face-*of'o'nly T oiieof the glass plates A, B," such=asthe plate A of Figure '17. In Figures 9-1'1 Wehaveshown 40 the foriri above described in connection with Figures' 1-7 fnodified to employ a half round threaded rod 20; its flat fa'de'loeing' designated by the ref- I "eren'ce' hara'cter 20*1' its lower end is suitably "secured coaxially to l the "fulcrum member 2 I but withthe' flat face 20 thereof oriented so that its'plane coincides" with the axisX-X of the ful- "crurh' member 2! (see"Figure 10) and extends 1" at rightangles to the axis Y-Y;' This orienta- "tion," which is also an orientation relative to the hook-shaped parts 2425 and to' the opposed upwardfext'ensions 3,134, thus brings the "vertical .plan'efl igure 9). in which the longitudinal center linesof thesfrontclamping parts 26, 27' move as I their 'a'ngulariti'es are changed, at right angles to the flat fac"20 which'th'at' plane bisects along "its own vertical centerdine. Accordingly, when thehalf round ro'd 2flis entered through'the' half round transverse'groove cut into glass plate A, that groovebeing closed over by the edge face F 15f theeompanion glass plate B,this edge face F, being vertical in the illustration of Figure 17, causes'th fiat 'face 2% of the threaded rod 2i3 to fall 'ina'irertical plane, in 'efi'eot'keying the half round'rod ZBagainst rotation, about its axis; and "thus"the"front clamping part-s 25,21 are brought 'up' against the outer or front faces of the glass "plates' A',"B with their eenter lines falling-in a plane'atrightangles to the "apex of the angle foriri'ed by theTtwo glass plates. Andas shown "in Figure 9, the hole 50 injtheequalizer yoke 50 -rdi me erwof -f 1 1f ,.me1nber 21, o thatljtheir is preferably also halfjroundto internt with the inner ends ,enter, with appropriate small clearanee,.=between theside parts 33 andjjm andiinto the inte1'ior -of -the,hollow fulcrum member 2|. And. as abovetnotedthe radius oi the ca;n face i halfround tension rod 20 and thus align the longitudinal ceriteflineiof the yoke arms 56 59 in a plane at right angles to the just mentioned 5' apex. "Thereby alsotheyoke 50* cannot-turn 11 about the axis of threaded rod 20, and it is thus easy to align the arms of the bent back clamping plate 45 with the respective arms of the equalizer yoke 50.

Inasmuch as the clamping nut 31 (Figure 9) acts upon relatively short lever arms of the front clamping parts 26, 21, being those portions of the latter that overhang the fulcrum member 21 interiorly, the reactions upon the cam nut 31 may be substantial when the length of these short lever arms is compared with the over-all lengths of the front clamping parts 26, 21 themselves, and to insure good and relatively tight interfitting of the inside threads of the cam nut 31 with the threads of the half round tension rod 20, the former being of 360 extent and the latter of only 180 extent, we make provision for depend-ably holding the half round rod 20 and the nut 31 coaxially and against such tendency for relative radial shift therebetween as might be permitted because of the substantially half round cross section of the rod.

For this purpose the radius of the half spherical nut 31 in Figure 9 is made less than the radius of the nut 31 in Figure 3 by an amount equal to the thickness of the sheet metal of a shell 53 (Figures 9, 10 and 11), which is substantially a hollow half sphere with the radius of its outer spherical surface substantially equal to the radius of the inside faces 28 of the front clampa ing parts 25, 21, thus providing an interfitting action with the latter the same as that of the cam nut 31 of Figure 3 as earlier above described. Cam nut 31 fits snugly within the shell 53, and the latter has a flat circular bottom 53 which closes over the lower end of the threaded hole in the nut 31 excepting for a semi-circular aperture 53 that provides a straight edge face 53 that extends along a diameter of the threaded nut hole, the radius of its half circular edge being substantially equal to the radius of the half round threaded rod 20 so that the latter can and does pass through the semi-circular opening 53 with its fiat face 2!) engaging the diametrical edge face 53 of the shell 53 and in effect holding the half round threads on the rod 20 always snugly interengaged with and seated in the internal threads of the nut.

With this arrangement, and as better appears from Figures 9, and 11, the several parts are seated or nested one within another for mutual sustaining and reinforcing action; the inner ends of the front clamping parts 25, 21 are snugly re ceived between the upstanding opposed parts 33, 34 of the fulcrum member 2|, the shell 53 nests within these inner ends of the clamping parts 26, 21 with its external convexed cam surface substantially interfitted with the internally concaved faces of the clamping parts, being keyed or held against rotation by the manner in which, as above described, the half round rod interfits with the semi-circular aperture 53 in the bottom of the shell 53, and the nut 31 is'snugly fitted and nested within the shell 53 itself. Here see also Figure 10. The nut 31 has a cross slot 46, as does the nut 31 of the form of Figure 3, to receive the prongs M of the sleeve wrench 42 (see Figure 8) to turn the nut 31 to seat the front clamping parts 25, 21 to their respective and equal angles relative to the axis of the tension rod 25, in the manner earlier above described. The shell 53 closes off the outer ends of the cross slot 40 in the nut 31 the diameter of the sleeve wrench 42 of Figure 8 being appropriately less than the inside diameter of shell 53 and accordingly, the

' except that at their clamping part,

sleeve wrench cannot become interengaged with; the cup 53 itself but only with the nut 31. As. the nut 31 is turned to move it up or down along; the half round threaded rod 20 (Figure 9) the same lever action of the clamping parts 26, 21' about the fulcrum edges 43-43, 44, 44 takes place as earlier above described except that in the form of Figure 9 the rotating nut 31 acts upon the short lever arms through the non-rotating shell 53, which acts through its diametrical cross edge 53 to maintain threaded rod and nut in sound interengagement and in coaxial alignment; thereby insuring that the full strength of the inter-- engaged threads, particularly those on the half. round rod, is available to transmit stresses with-' out damage to the threads and, in maintaining nut and threaded half round rod coaxially, providing for equal effects on the inner ends of the clamping parts 25, 21 to set each one to the same angle to the vertical axis of the rod 20. The nesting of the several parts as above described, particularly when the parts are under stress, coacts to insure maintenance of coaxial relationship between shell 53 and nut 31 as at the mating spherical surfaces of the two parts.

As above noted, our invention may be carried out in other forms, all operable according to the principles above disclosed; several modifications are about to be described and it will be understood that, though they are described in connection with the use of a half round threaded tension rod, utilizing a nut 31 and coacting shell 53 as just described in connection with Figures 9-11,, this is not intended by way of limitation.

Referring first to Figure 12, at the lower end of the threaded tension rod 20 there is :a fulcrum member 2 l which is substantially the same as the member 2i of Figures 1-11 excepting that it is devoid of the opposed hook-shaped parts 24, 25 so that the curved or arcuate fulcrum edges 43-43 on one side and 44-44 on the other side are respectively continuous, as indicated at 43*, 44 the remaining portions of the fulcrum member 21* being identified by the same reference characters as the corresponding parts in Figures The outer or front clamping parts, in Figure 12, are indicated at 26 21 and they are the same as the parts 25, 21 of Figures 1-11 inner ends they are not provided with the holes 32 and instead they are provided each with a depressed portion 55 that extends from the cut-out 35 and along the longitudinal center line of each throughout a distance materially less than the inside radius of the cylindrical wall 22 of the fulcrum member 2|. The portion forms an external bulge which is of materially lesser peripheral extent than that of the clamping part itself (see Figure 14) so as to leave to either side thereof, as is better shown in Figure 14, substantial arcuate extents of the inside face 28 for engagement and nesting thereagainst of a nut like the nut 31 of Figure 3 or the shell 53, as indicated in Figure 12, with the nut 31 nested in the shell. In direction lengthwise of the front clamping part the bulge 55, as is better shown in Figure 13, curves somewhat gradually into the outer face 29 of the but does so to form an angularity with the face 29, as indicated at 56 in Figure 13. The front clamping parts 25, 21 are assembled to the fulcrum member 2| by resting their adjacent ends as viewed in Figure 12 onto the respective curved edge seats 43*, 44 but with the bulges 55 of each overhanging the fulcrum member Zi interiorly, as is better shown in Figure '5; 'th' fesfiectiVe an'g'ularities 56' forming ineeffect 'ext'erhar seats locatorseforizfixing :the :point '""'about "which": each clamping D&I"b1"26?5, '21? is; to

pivot with the edge'fa'ces M 44. 3 serving as;fulc'rum' 'edges for cdactionwiththe:external faces 29'. Tliese-externaltbulg'es 55; .thus;serve to -hold thy-clamping {farts-26 "21%: against. :movement outwardly atvay' froin :"th'ahollownfulcrum .member 25*; -thro'u'g' hout theirfrange or swing or ad- J'ustm'ent to the external? angle C. dfwthetglass plates A, n me to theinterfittingaandinesting of th'e fiarts' and the 'coactiombetweenuthenut andthe fulcrum member, the clamping parts ZS zl -areheld assembled andagainst dislodgment out of thei1" r'espectively: adjusted .equi angular ositionsfthe'bulge 55 inseam precludingwithdrawal of eitherclamping zpartrendwisez'out from inhetween its-companion'nestedrparts. LiThenested 'relati'on'shib of ztliewconstruction ofi Figures 12-15 appears substezitiallyethefsame as shown in Fi'gure 1ofomittingitherefroml'thezhocbshaped par-ts. 2'4? 25 end: the holes 32." l-lWhenr installed the device appearshom :the front as; shown in i Figure/1 6',- appearing-:much;:the?same as that of I F'igure'-1* 'excepting".that -the-'hook+shaped mem' ="="ber's Z4", 25 of'a the:*lattermfigurevaresabsent in Figure: 1-6,- 'and-the devicaappears, as seenafrom the insid-eg substantiallyz-the-same asvrshown in pldyed, or asseen Figure -17: when a half round tension rcd is employed.

"Referring nowt'oflFigures-=l8.-2l-,-:the. modificare *tion"'theremfl'shown -is in all" material -respects the same asthat of; Eigure 12- excepting that: the inner-ends of sthefront rclampingrpartsr-are dif ferehtly shaped fonassembly and? coaction' with the cammut whether the-latter coactsl directly therewith like' thernut 31 of Figure 3 'or coacts therewiththrougha shell like the shell153 related to the nut-31 as describedabove; in; Figures 18 --acters; the--two -frontclam-ping elements -how- 1 ever, beingidentified-in FigurslB-Zl-by the ref- 1 1 erence I characters 26 2 1b: The latter, :like those of the-above deseribednmodifications,Yare iden- -tical in construction and are interchangeable, and theycan thus be --made :-in the same-. process or by the-same-tools, as in suitable punchl-pre operations.

At' thei'r: innerends": (Figure 18) :the front clampingpartslB 21E areishape'dzand cutaway substantially :asshowrrgisee. also-Figures 4-9: and

20): butonly 'throughout those inner end :portions that overhang-the hellow'fulorum; member 24*- interiorly; -Nl7zithin that overhangingportionzeech 1 member is cut away astat 58 :along twcnlines or planes 59, 6B, of which the-former,isq-parallel" to the-centralverticalrplane of the clamping-part as "along the'central TaXiS' Z.Z of Figure 19; be-

ingr displaced therefrom by aaadistancetabout equal=-to the-radius of rod 20, and of which the w other extends-at 90- toth'e-axis Z-Z.: The two lines 59;:60 are joined in .a curved lineas-indicated at 6 hora radius of curvature somewhat greaterthan theyradiussof v the threadedstension rod 20 -,-which--is indicated int-broken lines in Figurew I :7 19;- the :centerof thecurvatureofrline His cated on the axis Z-Z .,andis-spaced from the ex-treme innermosti end of the clampingpartby inside and-: outsidesfaces 28 129 that.are1on one side-of thecenter' linewvz -lezhbeingcextended and l,

Ffigure 2 =when anrouncl threadedz rod :is, em-

and 2-1- par-ts similar tel-those shown in Figures Curved inwardly as indicated at 28-, i.2 9}} .toward and up to the plane in-which falls thev,line 59, g each at itsown radiuswith the center of ,.t hfese curvatures rcoinciding substantially; with the cen- 5 ter of curvature of the cutout 6|, thus juxtapos- 5; ing to the- ,cutout 5,8a quadrant 62 in which' the faces 23?;29 are spherical. a

.When the elamping parts-ZBE, 2'i are,a ssemi-bled to the-fulcrum member-2 l on, the threaded l0 tension rod; the partialtsp herical .portionsl or --qua1:lrants 62 fall to opposite. sides of theltension rod, the recesses or .-cutouts 6i complementwing each other and -forming.. -together a, hole through which the-threadedrod passes with plenty of clearance, and the quadrant-like --spherical-.portion 6 2 of theone clampingpart becomes-amplyaccommodated in the cutout 58 of the other clamping part-, .and together they *just neatly fit inbetween theupstanding side parts 33; 34 of the fulcrum; member-21 and together the. spherical internal faces 28 thereof. form a seat intoiwhich the shell 53 (or the nut 3'5 of Figure 13) "neatly nests; being of the same radius J of curvature. This internesting or interfitting of theqpartssubstantially as just described is .better shown in;Figure 21, andfthese relationships of the parts are maintained throughout the range of adjustment of angularity ofithe v clamping parts 26 2T as the cam nutris turned .to thread it up or :down with the aid of the sleeve wrench 42 coacting withnthe cross slot 58 in the nut. The partsarethua held assembled and I againstmisalignment," The two ,clampingparts ZS -H arev always held withtheir centervlines in=the 'verticalplane through the axis Y-Y (see Figure 21) 10f the fulcrum member Zia and neither can be, withdrawnfrom the assembly for the hollow fulcrum-member 2l vprecludesthe necessary relative transverse movement therebeie-tween along the axis XX of Figure 21 to effectappropriate enlargement oropening up of the seat formedhy the complementary quadrants 52, 62 through-Which-the threaded rod extends, all in: coaction withthe camHnu-t (with or .Wlthout. the shell- 53) which v,holdsthe parts nested and, moreover locks each clamping ,part, against -w-ithdrawal because it is,se ate dagainstrthe quadrantelike inner face 28% which extends to theother side of; the cam structure As in the .-:otheriorms, a wide range of angularity between the front clampingHpartsEm-ay be achieved; with each clamping part making the same-rigid. angle to the axis of the threaded tension rod; for example the front clamping parts. 21 of -Figure 18 may be accommodated to angularities corresponding to values for the external-angle .-C;-of Figure 16irom-about 160 to about. 315 or less, that being an illustrative range throughout which the above described parts coactinmain- 0 taining the assembly and alignmentsand anguzlarities as just notedw Moreover, the fiat or plane edge faces throughoutwhich the front clamping .parts 26 21bengage the front faces of, the ,glass kpanels A, B. transmit to: and- =distribute throughout, substantialareas oi the; two glass panels themiamping pressures which are transt-mitted-gto the, frontclamping-;parts through the fulcrum seats -,or e dges"43B, 443. respectively of the,-- hollow;-fulcrurn member Zia, the ,lattervthus .70 ,pressine thflqql mping parts flatwise against the glass-panels, a d :thus aiding vin ,rnaintaiming the l nm oi the mm tqlam i gi aI SL a a v described; The front; clamping ,parts are thus dependably; a1igned,;vvitn eaeh pther aha; also minate a t e a a na'elienedc, i

5 back clamping parts 46, 41 respectively, to which full round and cam nut like nut 31 of Figure 3 may be employed without utilizing the centering shell 53'. In Figures 22-28 the front clamping members are indicated by the reference characters 26, 21, and they are formed out of a single or unitary piece of suitably ductile metal, out of which they may be formed in any suitable manner, as by casting or, preferably, as by stamping out of suitable sheet metal stock.

Each front clamping part 26, 21 is preferably hollow as in the other forms above described, being preferably concavo-convex in cross section (see Figure 26) and they may be arcuate, conveniently of 180 extent; thus each has an inside concave face 28' and an external convex face 29 and each is closed off at its outer end, as at 30, all as earlier above described in connection with the other embodiments.

The unitary casting or stamping that comprises the just described front clamping parts 26, 21 is provided, at its center, which is the intersection of its central longitudinal and transverse axes (see Figure with a round hole 65 of a radius equal to the maximum radius of the threaded tension rod 26 so that the latter, whether full round or half round, can neatly extend therethrough with its axis coincident with the center of the hole. With the threaded rod so passed through hole 65, the upstanding side portions 33, 34 of the fulcrum member Zi being the same as that described above in connection with Figures 12 and 18, just snugly receive therebetween the longitudinal sides of the unitary straight structure 26--21 as the latter is brought to rest with portions of the external arcuate faces 29, 29 of the two clamping parts 26, 21 adjacent the hole 65 brought to rest respectively against the upwardly concaved fulcrum edges 43, 44 of the fulcrum member Zi as indicated in full lines in Figure 28; thereby the straight unitary structure 26-21 becomes aligned relative to the fulcrum member 2H, its longitudinal axis becoming aligned with the axis Y-Y of the fulcrum member 2| and its central transverse axis becoming aligned with the axis X-X (Figure 28) As appears better from Figures 24, 25, 26, to each side of the longitudinal axis and aligned with the transverse axis, we provide slot-like diametrically opposed cutouts or extensions 66, 61 of the hole 65; these slots extend along the plane of the central transverse axis of the unitary member 26-21, following along the arouate cross-sectional curvature (see Figure 26), and they terminate adjacent to but spaced from the plane of the continuous peripheral back edge, leaving appropriate thicknesses of metal adjacent opposite longitudinal back edges to form bendable bridges 68, 69 respectively, each being of a cross section, as is better shown in Figure 26, to provide ease of bending, without tearing or l6 rupturing the texture of the metal of the bridges, about a central transverse axis closely adjacent to the plane of the continuous peripheral back edge of the unitary device 26-21. Preferably, the outer ends of slots 66, 61 are rounded, as is indicated in Figure 24, to facilitate bending in either direction about the just stated axis without tearing or rupturing the texture of the metal.

At whatever the angle C (Figure 22) to which the front clamping parts 26, 21 (Figure 24) are set, illustratively within the illustrative range or ranges above mentioned, by bending at the bridging parts 66, 69 (an illustrative bend, where the angle C is greater than is indicated in broken lines in Figure 24) portions of the inside arcuate faces 28, 28 of the two clamping parts 26, 21 are presented upwardly, to each side of the axis of bending, for bearing engagement with the cam nut 31, as in Figure 3, where the tension rod 26 is full round, or with the shell 53 (Figure 24), where the tension rod is half round and nut 31 and shell 53 are employed for advantages and coactions as earlier above described, and by applying the sleeve wrench 42 (Figure 8) to the nut to turn the latter on the threaded tension rod, each front clamping part 26, 21 may be set to the same angle to the axis of the threaded rod with the sum of the two angles equal to the desired value of the external angle C. The nut, directly as in Figure 3 or indirectly through the shell 53 as in Figure 24, can be made, by threading it downwardly, to exert upon the inner ends of the clamping parts 26, 21 appropriate forces to depress these inner ends about the uppwardly concave or" arcuate edges 43, 44 respectively of the hollow fulcrum member 2F, these edges serving as fulcrums about which the clamping parts 26, 21 are tilted upwardly in the same increments of angularity per increment of downward movement of the nut, the latter thus operating, through lever-like action, to efiect bending at the bendable bridging portions, 66, 69. Or the bending, to the desired angularity, may be effected manually, also when the angle C is somewhat less than 180 and the direction of bending is downwardly as viewed in Figure 24, it being noted, in this latter connection, that the width of the slot-like extensions or cutouts 66, 61 is selected to permit a suitable degree of such downward or reverse bending, and in such case the hole 65 is correspondingly elongated in the direction of the longitudinal axis of the parts 26, 21. Whatever the range of bending provided, the vertical dimension or height of the diametrically opposed side parts 33, 34 of the fulcrum member 2 P, in relation to the upwardly concave (fulcrum edges 43*, 44, is sufficient so that the apex of the angle of bending, being formed by the bent bridge parts 68, 69, falls below the top edges of these side portions 33, 34, thus maintaining a substantially nested relation of the bent member 26 21 with the hollow fulcrum member Zi with the nut (with or without the shell 53) in turn nested against the inside faces 28 for equalized abutting or holding action upon the inner ends of the two clamping parts 26, 21, thus to rigidly hold the latter against enlargement of the equal angles which they make with the axis of the threaded tension rod 26.

When installed, as shown in Figures 22 and 23, the just described relationship of the parts, including the holding action of the cam nut on the inner lever arm ends of the clamping parts 26, 21, aids in maintaining rigidity of the justmentioned equal angles and in causing each front 1 'Z clamping part 26, zl to-functionsomewhat like rigld cantilevers; the I latterapply I and" distribute to the clamping pressures or forcestothe-front various parts. All of these actions are furthermore aided by the relatively rigid-j unctions which. the bent bridge parts 58, 59 form between the two front clamping parts 26, 27;these junctions. contribute toward holding the longitudinal axes. of the clamping parts 25; each other and coact with the side portions 33., 34 of the fulcrum member Zi in maintaining these aligned axes and. the axis Y'-Y (see. Figure 28) in the same-verticalplane throughthe axisof. the threaded tension rod 29.

As the several illustrative embodiments of our invention demonstrate, the corner clamp construction is multi-angular, throughout. a wide range, in its capacity to be set in small incre-t ments of equi-angularity of. its clamping memebers relative to the bisector of the angle made by the glass panels and in its capacity, throughthe coactions between the adjacent lever arms of the front clamping members and.v the nut 3.7 or nut 37 to which the front clamping members are set;. these lever arms and the nut (with or without the shell 53) are, moreover, interfitted or nested. for ease and precision of equi-angularly setting, in minute increments and by a micrometer-like: action, the two front clamping members: to the desired angle and for thereafter, by direct action on these lever arms, dependably holding: the clamping members at whatever angle the micrometer-like action has set them.

The back clamping parts 55, 4 l',.being preferably integral or unitary and bendable at theintegral bridge parts 68, 69, with the arcuate equalizing yoke. 5i dependably coact', in'the actions and functionsjust described, not only in ready adaptability to a wide range of change for the inside angle D and ready accommodation thereof to the fiXedangular-ity given to the front clamping members 25, 2?, but also in contributing to the-achievement and maintenance of the desired rigidity of angularity of the various clamping parts; more specifically,

provide a rigid triangulation of clamping and holding forces, as will be apparent, .in view of the foregoing, from a considerationof Figuresl, 1'7:

and 23.

The inside angle D is the complement to the outside angl C, the two summing up to 360-. Though the coacting back clamping parts are: shown in Figures 2, 17 and 23 assembled topanels A and B whereangle D is less than 180 the bendable back clamping part- .5: and the as in the other forms, in achieving and maintaining good seating of. the.

27 in alignment, with.

with its shell 53, to fixedly hold the angle;

these back clamping. elements, all when assembled as abovedescribed,

ing force, also with rigid triangulation: of the.

forces involved.

The. just-described relation is shown in Figure 33 and is there illustrated in plan rather than in perspective in order to show more clearly the relationships at the back or inside angle D and also to show certain variables in the rela tionship of parts at the front or external angle C as the latter ismade smaller. Lrthis latter connection, it will be noted byre'ference to Figures 1., 16,. and 22"when compared; with Figur 33, that the fulcrum. member (2! or 2|) has. the ends of its opposed side parts 33, 3c closest: to the apex. of. front angle C when the latter is of. maximum value and that fulcrum being farthest therefrom when angle C is of minimum value; for practical purposes, a mini mum value for angle C may be assumed to be inasmuch as plate glass window or show case panelsor the like of lesser front angles are rarely if at all met with in practice. For illustra tire: purposes, a 90" value for front angle C is assumed-in'Figure 33-; The latter shows the substantial. extent of. recession. of the fulcrum: member from; the verteaofangle C and that could be ofa magnitude sufficient to. bring the adjacent inner. ends of. the frontclamping members above described, with. which thenut t'l' alone or nut Bi and shell 53.1coacts, out ofcoacting relation with the opposed side parts 33, 3 3; that is why, in the foregoing description, we have given an illustrative range of change offront angle 0 from a value materially less than 180 (say,- around to about 315, forat the lower limit (just below 168, illustratively) thedesired nesting of- .interfitting par-ts between-and with the opposed in theformsabove described, the lever-like per-- tionofeach. front clamping member, that is, the portion that: overlies the hollow fulcrum-member,

is-substantiall'y in line with the remaining per-- tion of: the clamping member that engages thepanel front (see Figures 4, 13, 19 and 25); with respect to. the fulcrum: provided by the hollow fulcrum-member, each front clamping member isin effect astraight-linelever, that is, its leverarms. to either. side of the. fulcrum are in line with each other. arrangement; our device may be setthroughouta range of. front angle values. from. about 160? to.

315. If, however, we provide an angularity between the-two lever.- armsof each frcnt clamping member, we are enabled to. shift: the range of change of angle correspondingly; thus: we illuse trate' inlligures 3493'? and we have selected. the. form. shown in. Figures 12-15 to illustrate how. weeffect. this modification; for; this purpose.

Referring first to Figures; 13 and 15, and as.

above described;. by. providing; the. bulge. 5.5. We.

achievev an external; angularity at 5.6 into. whichv the upwardly concaved fulcrum edges .3-, it- (Figure 12) can seat or engage; the described arrangement: of: a, bulge. can thus leave the two lever arms of; each; clamping; member 28*, 27 in line; At: justvaboutzthesame region where the re-entrants.angularity 5.6: is formed in Figures 13;. 151 and 12; weagivethe; entire clamping member: indicated at. 2.6% and; us in; Figures. 34-37, as;

As. above indicated, with suchures 36-37).

by suitable stamping operations in forming it,

a suitably sharp bend, thus to give the inside or overhanging short lever arm portion the desired angularity to the external lever arm portion that rests against the panel (A or B); illustratively, that angularity may be about 90 (see Fig Externally that bend provides a re-entrant angularity 53 on the non-clamping side of the front clamping member in which the fulcrum edge (33 or 3 remains seated throughout pivoting movement of the clamping member about the fulcrum and holds the clamping member against detrimental longitudinal shift relative to the fulcrum member. That angularity 56 is sharpest at the longitudinal center line (see Figures 35, 36 and 37) and rounds off progressively in arcs or surfaces of revolution to either side of the center line in order to provide appropriate external surface curvatures to better coact with the upwardly concave fulcrum edges 43, it throughout changes in angularity of the clamping members 26 and '21 relative to the axis of the threaded tension rod 23.

The downwardly extending short leverarms as viewed in the drawings have cut-outs or slots 35 at their extreme ends within which tension rod 20 is accommodated when these lever arms 6 are horizontal or substantially so and as the ing between the panel angularity of 90 for its" internal angle (as suggested in Figure 1 at D) to a panel angularity of 90 for its external angle (as in Figure 33).

However, the front clamping members of Figinstallation requires it, to replace them by correspondingly constructed front clamping members in which each has suitable angularity between its two lever arm portions like that described in connection with Figures 34-35, an angularity that downwardly (in Figure 34) to change the angle of the panel clamping arm portions; they have external fragmentary spherical or convex surfaces so they can take inside against the correspondingly curved inside faces of the fulcrum member Zi (see Figure 37) at one limit of,

setting (shown in Figure 37) and they have inside spherical or concave faces to coact with the convex faces of the nut 3'! or of the shell 53 where member 20 to permit clamp members 26 27 to each assume an angle of materially less than 45 degrees to the axis of the threaded rod 20 at about which point there is still maintained coaction of the nut 31 or of the nut and shell 53 with the concaved and now more or less horizonj tally positioned short lever arms as well as ooaction of the latter with the upstanding opposed side portions 33, 34 of the fulcrum member 21*.

Thus, adjustment or setting of front clamping members 26 27 to match a small value re- C of the front clamping members. In the illustrative modification just described, it will be seen that the available range of change of angularity has been shifted to a range in which the lower limit for angle C is changed from about 180 to much less than 90, as a result of a 90 angularity between the two lever arms of each front clamping member. Were that re-entrant angularity in the lever arms to be made for example 135 or so, the range becomes from about 270 to about 90 for front angle C; thus a single conformation of front clamping member suffices to meet all front or external angularities varyis re-entrant on the non-clamping side of each, with its vertex at and coacting with a fulcrum edge of the fulcrum member. 7

As above described, the tension rod 20, whatever its cross section, that is, whether round or partially round with a fiat face, may be secured or connected, in any suitable manner, to the fulcrum member 2| so that, the two are coaxial and so that, when the clamping construction is assembled to the glass or other panels and the rod 20 is placed in tension by the nut 51, the

desired coactions and relationships between the various parts are achieved as above described; the mechanical connection between the tension rod. and the hollow fulcrum member may be effected, in so far as certain features of our invention are concerned, by any suitable or known means, such as a threaded connection, welding or brazing or the like, but according to other features of our invention the threaded rod and the fulcrum member may be secured or connected together in the manner about to be described and as shown in Figures 29-32, in order to achieve certain other advantages of construction and assembly.

Turning first to Figures 29 and 30, we there show a construction adapted for connecting these two parts together when the tension rod 20 is round. In these two figures we show the bottom wall 23 of the fulcrum member, and in forming or' shaping it we flatten it at its lower end to provide a circular flat portion 23 that is coaxial with the fulcrum member and at its center and axis we provide a hole 7! suited to receive therethrough the threaded rod 20, being therefore round as is better shown in Figure 21. The lower end, as viewed in Figure 30, of the threaded rod 20 has integrally formed therewith a head a appearance when viewed as in Figures 1, 16 and 22. With this construction the hollow fulcrum member is simply slipped onto the threaded rod 20 to'bring the flat face of the head 20 into flatwise engagement with the flattened portion 23 of the wall 23, thus insuring proper alignment'and coaxiality of the parts.

Where the threaded rod is half round and has a flat side face 20*, we provide in the flat,-

amazes;

toned wall portion: 23.. a halt-lioundhola 1:2: as:

is better shown in, Figures. 3.1 and;- 32,. as bit broac'nlng, but hole 12 is, oriented; with. respect: to the axes XX and Y.Y. in that its straight side, bemg a diameter, coincides with. the, axis. X-X and. its midpoint. falls on. the axis-.Y-Y. The lower end of the threaded rod is. provided, with a head 26, as above described, being inter graily formed therewith and; providing an upper.- flat circular face that can mate with. the. under. face of the lat wall portion. 23 and has an external frusto-spherical. face of the sameradius as the outside face ofthe Wall 23. As. seen in Figure 32, the half-round rodv 20. appearsv offset:

in relation to its head 20, but it will baunderstood that the arcuate or curved surfaces; of: the two parts are coaxial, bringing the fiatlsideface 28 in alignment with the diameter of thehead: 2th

With this arrangement assembly of; thehollow fulcrum member to the half -round headed: rod 29, as by entering the free end of the half!- round rod through the half-round hole- 12 from the under side of the fulcrum mem ber, thus also achieves an orientation of the fiat side face 23 of the rod 20- transversely. of the axis YY and in line with theaxisX-X for purposes earlier above described, the large fiat engaging faces of the head 29 and of the.

flattened bottom portion 23 'coacting to hold the fulcrum member and the threaded rod coaxial. Externally the head 2% merges intothe surface of the wall 23 Without disturbing the continuity of dome-like appearance as seen in Figures 1, 16 and 22.

In applying clamping devices at spaced intervals along the junction J of the panels A, B, (Figures 1, 16, 22 and 33), it is advantageous and desirable in certain installations, as in glass panels for store fronts, to apply to the front or external clamping members acement or caulking compound, usually in plastic form, andwith the device of our invention, after manipulating the nut, such as nut 37 or 31 to set the angularities as above described to match the ex-- ternal angle C, the cement or compound is easily applied by smearing it into the hollow interiors of the front clamping members and into the exposed spaces of the hollow fulcrum member; the material canbe applied in excess, and upon completion of assembly'of theback clamping elements and upon tightening up the back clamping nut surplus cement or compound is expelled as the filled hollow parts are pressed tightly against the faces of the panels. The excess or exuded material is simply wiped off, leaving the front or external structure which not only is cemented to the panels but also has its interior well sealed off from the atmosphere and the elements where the installation is an outdoor installation, as with a store front. Or sealing and protection may be provided as is about to be described.

We provide a two armed sealing and protec-- tive member made of a suitable deformable and preferably resilient material, like rubber (natural or synthetic, or any other elastomer), which can be molded and cured todesired resiliency; it is shaped to provide, as shown in Figures 38-39, a central body portion I6, apertured at H for the passage therethrough of the threaded tension element or rod 20, for coaction under compression between the vertex ofthe angle 0 and immediately adjacent parts'such as the nut 31 or 31 and fulcrum memben 21 or:

22-? 2!?" and. it: has; two; oppositelyextending. am.- like portions. 18:, 19 externally convexed to: s at. pectively into the concaved houows of: the two front clamping. members such. as it and 21 and. presenting. compressible faces or 0011? formations as, at; 81., 8 I that bulge above or b.eyond; the. plane of. the peripheral edges of. the. front clamping. members by which the latter ene gage flatwise against the panels.

As shown. in. Figure 39, the. arms 18,19 make an. angle to. each other and this, for front re.- entrant angles (as in Figure 33), is preferably. aboutv equal. tow the smallest angle (for. illustrae tion, of the range of. angle change. of the. front clamping members and for that angle. the. thickness (asseen in. Figure 38) of thecentral body portion is somewhat greater as. the dis-. tance along axis of. threaded rod 28 from the apex of the re-entrant angle C (see Figure 33)- to about the plane of the slotted face or": nut 31 or nut 31' when. in the position to set the front clamping members to the minimum front: re-entrant angle. As above earlier noted, the spacing or distance just mentioned grows less as the re-entrant angle is increased from. its

minimum value. Resilient member i5 is as-. sembledto the device shown in Figure 34. by sleeving its central body portion It onto threaded rod 20 after the clamp members 26 21 havebeen set to the desired re-entrant angle, the convex surfaces of the resilient arms l8, l9 seat ing respectively into the hollows of parts 26 and 21 and the convex surface of central portion 16 overlying the fulcrum member between i the sideparts 33, t l-of the latter, thus presenting the above-mentioned bulging conformations Bl, 8| toward the panels A, B.

As shown in Figures 38 and 41, these bulging conformations 81, 8!, which cross-wise of the arms and of the clamp members 2 5 El are arcuate, progressively diminish from the endsof the arm portions 18, 19 to the point where they intersect each other and also the axis of hole 7T; Under the pressures exerted by the clamping effects upon the panels A, B, the parts- 18, 16, 19- ofthe rubber member 15 are compressedas the front clamp parts 26, 2'! arepressed against the panels and as the central portion 16 is compressed in the direction of the axis of the threaded rod 2!], completely sealing off and protecting all portions of the device at the front of-panels A, B except for-the external surfaces as seen in Figure 33 and neatly fillingthe peculiarly shaped space or volume caused by the spacing of parts from the vertex of the re-entrant angle 0.

As center part 1.! is subjected to greater. com.- pression as angle 0 in Figure 33 is increased, it tends. to flow or distort the rubber or rubber-like material laterally of itself and lengthwise into the adjacent ends of the hollow clamp parts 26, 21 such action also taking part when the member 15 is. initially distorted into. a greater angle toaccommodate. it and its armextensions to a. greater angle when the clamp parts are initially set for such a. larger angle. The lengthwise tapering off, toward the, apex of member I5, of the extent of the bulging of the conformations. 81, 8I, facilitates the above actions so. that a rubber member 75,.of; given angularity. as molded. serves to-make a good sealand neat appearance throughout a; substantial range of re-entrant. an ularities...

ntrallrvalues otthea el C; figure 1. nd

22),the installed devices appear diminutive and; r

are neat and attractive in appearance.

As above described, the front clamping members, in all forms, present flat or plane faces or surfaces which can rest fiatwise against the outer or front faces of the glass panels A, B (see Figures 1, l6 and 22), and in the illustrative em- Cil bodiments these faces comprise the peripherally.

continuous back edge faces of the concavo-convex front clamping members; through them the clamping pressures exerted on the two panels, in

threaded tension rod and the external convex portions of the front clamping members that seat against these concave fulcrum edges provide for an appropriate range of relativerotational self-accommodation or self-adjustment therebetween as the fulcrum member presses and strains the front clamping members against the fiat front faces of the respective panels. 'The front clamping members are thus permitted to come to rest fiatwise against their respective panel faces for distribution to the latter of the clamping pressures and the fulcrum member is prevented from tending to tilt either or both of the front clamping members about their general longitudinal axes, such as the axis Y-Y above mentioned. For these purposes it will be understood, as above indicated, that the width of the holes 32 (Figures 3-5, 7 and 9-10) in the front clamping members 26, 21 is somewhat greater than the width of the hook-shaped lugs 24, 25 so that the clamping members can partake of self-adjusting rotational movement about the axis Y-Y (Figures '7 and 10) relative to their concave fulcrum edges 43-43 and 44-44. It will thus be seen that, in all forms, the convex outer portions of the front clamping members that rest in the respective concave fulcrum edges of the fulcrum member, in providing such selfcentering or self-accommodating relative adjustments under the applied clamping forces,

also contribute toward greater facility of installation and toward lessening risk of fracturing the glass panel or. panels.

It will thus be seen that there has been provided in this invention corner clamping devices in which the several objects heretofore noted together with many thoroughly practical advantages are successfully achieved.

As many possible embodiments may be made of the above invention and as many changes might be made in the embodiments above set forth, it is to be understood that all matter hereinabove set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

We claim:

1. A corner clamp construction for clamping panels of glass or the like in substantially edgeto-edge relation comprising a threaded tension element for passage through the panel junction and having suitably secured thereto and coaxial therewith, at its outer end, a hollow fulcrum adapted to be aligned transversely of the panel junction so that each overlies a panel, a pairof elongated front clamping members which, in I transverse cross section, are substantially concavo-convex to present theirperipheral edges for flatwise engagement with the two panels, said concavo-convex clamping members being with their convex faces respectively seated againstsaid diametrically'opposed concaved fulcrumv edges for pivoting movements relative to thelatter, adjacent end portions thereof overhanging said fulcrum member interiorly to form two relatively short lever arms each to one side of said threaded tension element, sides of said overhanging portions of said concavo-convex members being received and, substantially nested within and between said diametrically opposed retaining portions of, said hollow fulcrum member, means coaxial with said threaded tension element presenting a surface that is a portion of a sphere for nesting within and engaging with the concave faces of said interiorly overi hanging lever arms and comprising a nut in threaded connection with said threaded tension element whereby, in response to turning of the nut, the angularities of said concavo-convex clamping members relative to the axis of said threaded tension element are conjointly and equally set and fixed by a pivoting action thereof about their respective concaved fulcrum edges; means for holding said concavo-convex clamping members against detrimental lengthwise shift relative to their respective fulcrum edges for thereby maintaining substantially equal the effective lengths of said short lever arms, a pair of back clamping members adapted V to rest against the respective inside faces of said panels, each to one side of said junction and respectively juxtaposed to said front clamping members, and means comprising a nut threaded onto the inner end of said threaded tension element and coacting with said back clamping members to tension said tension element. 2. A corner clamping construction as claime in claim 1 in which said threaded tension element is full round and in which said surface that is a portion of a sphere is formed by an external face of said nut that is directed generally toward said hollow fulcrum member, said face of said nut having a curvature substantially the same as the concave faces of said overhanging short lever arms of said concavo-convcx clamping members, for direct entry thereinto and direct coaction therewith.

curvature as that of the concave faces of said short lever arms for entry thereinto and coaction therewith, said nut having a radius of curvature substantially equal to that of the inside face of said shell and-rotatively interfitting therewith, said shell having an aperture in its bottomv closely matching the cross section of said half round threaded tension element for passage of the latter therethrough and for thereby coacting to hold said nut and said half round threaded tension element against detrimental relative displacement out of substantially coaxial relation.

4. corner clamping construction as claimed in cla1m-1 in which said means for holdingsaid 25 concavo-convex front clamping members against material lengthwise shift relative to their respective concaved fulcrum edges comprises projections on said concaved fulcrum edges, said concavo-convex clamping members having recess means for respectively receiving said projections.

5. A corner clamping construction as claimed'in claim 1 in which said means for holding saidconcave-convex front clamping members against ma terial lengthwise shift relative to their respective'concaved fulcrum edges comprises upstanding ears, one for each fulcrumedge, each of said concavo-convex clamping members having an aperture spaced from its inner most end for respectively receiving said ears.

6. A corner clamping construction as claimed in claim 1 in which said means for holding said concavo-convex front clamping members against material lengthwise shift relative to their respective concaved fulcrum edges compri es means forming a bulge-like projection in the convex faces of said concave-convex clamping members in those portions of the latter that overhang said hollow fulcrum member interiorly, thereby forming an external surface angularity in each and with which said fulcrum edges respectively engage.

7. A corner clamping construction as claimed in claim 1 in which said adjacent end portions of said clamping members each makes an angle to the remaining portion thereof that is a re-entrant angle on the convex side of the clamping member, the means holding said concave-convex front clamping members against material shift lengthwise relative to their respective concave-d fulcrum edges comprises the respective vertices of said re-entrant angles in which said concaved fulcrum edges are respectively received.

8. A corner clamping construction as claimed in claim 1 in which said'adiacent end portions of said clamping members are substantially in line with the respective remaining portions thereof that respectively engage fiatwise said two panels.

9. A corner clamping construction as claimed in claim 1 in which said adjacent end portions of said clamping members make an angle with the respective remaining portions thereof that respectively engage fiatwise said two panels, said angles being re-entrant on the non-clamping sides of the clamping members for giving .the latter-a substantial range'of change of front angularity less than 180degrees.

10. A corner clamping construction as claimed in claim 1 in wh ch said means for holding said concavo-convex front clamping members against material lengthwise shift relative to their respective concaved fulcrum edges comprises respective extensions of said concavo-convex clamoingmemhers along opposite sides of said threaded tension element and past the latter and presenting hookshaped concave-convex portions to opposite sides of said surface that is a portion of a sphere, said extensions complementing each other and overlying the ,hollow interior of said hollow fulcrum member.

.11. A corner clamping construction as claimed in claim 1 in which said means for holding said concavo-convex front clamping'members against material lengthwiseshift relative to their 'respec-' tive concaved fulcrum edges comprises two integral bendable small-cross-sectioned connections :between said two concave-convex clamping members on opposite sides of said threaded tension element and "substantially aligned along a diameter of said partially-spherical face and substantiallyat the opposed 'panehengaging edge faces of said clamping members, said bendable connections being receivable between and respectivelyadjacent:saidretaining wall portions of said hollow fulcrum member for guidance thereof.

12. A corner clamp construction as claimed in claim 1 in which said nut has a portion directed toward the free end of said threaded tension element that is provided with wrench-engageable means that fall within a radius less than the radius of the side walls of the hollow fulcrum member for turning the nut by a wrench as it moves inwardly and outwardlyof said hollow fulcrum member.

13. A corner clamp construction as "claimed in claim 1 in which said nut has wrench-engageable means that comprises rec'essmeans in a portion directed toward the free end of said threaded tension element and on opposite sides of its axis and engageable by projecting means of a sleeve wrench 'removably sleeved on said threaded tension element from'the free end thereof.

14. A corner clampconstruction as claimed in claim 1 in which said threaded tension element is full round and said hollow fulcrum member has a round coaxial hole through which said tension element passes, the latter having ahead external of the fulcrum member, said head and said fulcrum member having coacting flat seating surfaces for aligning one with the other.

15. A corner clamp construction as claimed in claim 1 in which said threaded tension element is half-round and said hollow fulcrum member has a half-round hole oriented relative to said opposed concaved fulcrum edges and through which said half-round tension element passes, the latter having a head "external of the hollow fulcrum member, said head and said fulcrum member having coacting 'flattseating surfaces for aligning one with the other.

16. A multi-angular corner clamp construction for clamping panels of glass or the like which are in substantially edge-to-edge relation and make an angle with each other comprising a threaded tension rod for passage through the panel junction and having suitably secured thereto, at its'outerenda fulcrum member having two opposed fulcrum elements which are aligned on opposite sides of said threaded tension rod and equally spaced therefrom and thereby adapted to be aligned transversely of the panel junction so that each fulcrum element overlies a panel,

two elongated front clamping members adapted to rest respectively against the front faces of said two panels having their longitudinal axes substantially aligned transversely of the panel junction and coacting respectively with said spaced fulcrumelements atpoints intermediate of the ends of the clamping members for pivoting movementsirelative to the respectivefulcrumele- :ments whereby adjacent end portions of said clamping members extend respectively from said fulcrum elements toward said threaded tension rod and form lever arms that underlie said fulcrum member, said leverarms being cut away at their adjacent ends to provide clearance for said threaded tension rod and to bring said lever arms close to said threaded rod, means compris ing a .nut threaded on said threaded rod and providinga face that overlies and bears against both adjacent lever arms and that is movable axially in response to turning of the nut to apply forces to said lever arms to pivot said elongated clamping members about their respective ful-.

crum elements forthereby conjointly and equally setting andfi-xing the iangularities of said two clamping members relative to the axis of said threaded rod and thereby setting them to the angle made by the front faces of said panels, a back clamping means providing parts adapted to rest against the respective inside faces of said panels, each to one side of said junction and respectively juxtaposed to said front clamping members, and means comprising a nut threaded onto the inner end of said threaded tension rod and coacting with said back clamping means to tension said rod.

17. A multi-angular corner clamp construction as claimed in claim 16 in which said back clamping means comprises an elongated plate-like member apertured at its center for the passage therethrough of said threaded rod and to provide side portions at opposite sides of the aperture that are bendable and which demark said elongated plate-like member into the aforesaid two parts for bending of the one relative to the other to fit into the angle formed by said inside faces of said panels for resting them respectively against said inside faces, said side portions holding said two parts rigidly together to reinforce the angle at the inside faces of the panels.

18. A multi-angular corner clamp constructio as claimed in claim 1'? in which there is interposed between the nut threaded onto the inner end of said threaded tension rod and said bent elongated plate-like member, a pressure equalizer in the form of a rigid two-armed substantially arch-shaped part with its arms in respective engagement with said two parts of said bent therein, with the straight edge of the latter extending transversely of the line of the arms of said arch-shaped member, for passage therethrough of said half-round threaded rod and foraligning said two arms transversely of the junction between said panels.

20. A multi-angular corner clamp construction as claimed in claim 16 in which the face of the first-mentioned means that overlies and bears against both adjacent lever arms is a surface of revolution about an axis coincident with the axis of the nut, said adjacent lever arms having conformations adjacent said threaded rod that provide respective bearing surfaces for coaction with said surface of revolution throughout the range of pivoting of said front clamping members in response to turning of the nut.

21. A multi-angular corner clamp construction as claimed in claim 16 in which the face that overlies and bears against said adjacent lever arms is substantially frustc-spherical with its axis coincident with the axis of said nut, said adjacent lever arms having arcuate bearing surfaces against which said frusto-spherical face bears throughout the range of pivoting of said front clamping members in response to turning of the said nut.

of the lever arm whereby th said frusto-spherical face, in seating against each of the opposed sides of the axis of said threaded rod, coacts in aligning the longitudinal axis of said two front clamping members.

23. A multi-angular corner clamp construction as claimed in claim 16 in which said elongated front clamping members have apertures at said points intermediate of their ends, said opposed fulcrum elements having respective parts entered into said apertures for holding said front clamping members'against material movement lengthwise of their respective longitudinal axes.

24. A multi-angular corner clamp construction as claimed in claim 16 in which each of said lever arms of said two elongated front clamping members has projecting means ccacting with its associated fulcrum element and positioned on that side of the latter toward said threaded rod for holding the clamping member against material displacement lengthwise away from said threaded rod.

25. A multi-angular corner clamp construction as claimed in claim 16 in which said lever arms are cut away, each along the longitudinal 22. A multi-angular corner'clamp construction as claimed in claim 21 in which the arcuate surof the front clamping member, in the form of an open-ended slot whereby each of the adjacent ends of the two lever arms extends to both sides of said threaded rod for coaction with said face, the respectively adjacent portions of said slotted lever arms on the two sides of said threaded rod being integrally connected, forming a bendable connection that responds to the forces applied thereto through said face in response to turning of said nut.

27. A multi-angular corner clamp construction as claimed in claim 16 in which the said adjacent ends of said lever arms are cut away along opposite sides of the aligned longitudinal axes of said two front clamping members along respective lines to provide lever arm portions that extend past and partially around said threaded rod, said portions substantially complementing each other and underlying said face for coaction therewith in response to turning of said firstmentioned nut.

28. A multi-angular corner clamp construction as claimed in claim 16 in which said threaded tensionrod is full round and in which said face that overlies and bears against both adjacent lever arms is formed by an external face of said first-mentioned nut.

29. A multi-angular corner clamp construction as claimed in claim 16 in which said threaded tension rod is substantially half round and thereby has a fiat side face, said face that overlies and bears against said adjacent lever arms of said front clamping members comprising an external surface of a shell having anaperture in its bottom closely matching the cross section of said half-round threaded rod for passage of the. latter therethrough and for holding said shell against rotation about the axis of said rod, said shell having a portion that provides a surface of revolution about the-axisof said aperture the bottom of the shell and said nut having 'a surface of revolution in'terfitting with that of said shell for coacting to hold said nut and said half-round threaded rod against detrimental relative displacement out of substantially co'axial relation.

30. A multi-angular corner clamp construction for clampingpanelsof glass or the like which are in substantially edge-Lo-edge relation and "make an angle with each other comprising a threaded tension rod for passage through the panel junction and having suitably secured thereto, at its outer end, a fulcrum member hav- 'ing two opposed fulcrum elements which are aligned on opposite sidesof said. threaded tensic-n rod and equally spaced therefrom and P thereby adapted to be aligned-transversely of the panel junction so that each fulcrumelement overlies a panel, two elongated front clamping members adapted to rest respectively against the front faces of said two panels having their longitudinal axes substantially aligned transversely of the panel junction andcoacting respectively with said spaced fulcrum elements at pointsfintermediate of the ends of the clamping members for pivoting movements relative to the respective fulcrum elements whereby adjacent end portions of said clamping members extend rerod, said threaded rod being half round in cross section with its flat side aligned transversely of the aligned longitudinal axes of said front clamping members whereby, upon passage through the panel junction, said flat side is aligned with an edge face of one of said panels, means comprising a nut threaded on said threaded rod and a shell with which said nut iscoaxially and rotatively interfitted, said shell having a bottom wall that has an aperture therein closely matching the cross section of said half round threaded rod for passage of the latter therethrough and :for holding said shell against rotation, said bottom wall providing a face that overlies and bears against both adjacent lever arms and that is movable axially as said shell is moved axially along said threaded :rod in response to turning of the nut to thereby apply forces to said lever arms to pivot said elongated clamping members about their respective fulcrum elements for thereby conjointly and equally setting and fixing the angularities of said two clamping members relative to the axis of said threaded rod and thereby setting them to the angle made by the front faces of said panels, back clamping means providing parts adapted to rest against the respective inside faces of said panels, each to one side of said junction and respectively juxtaposed to said front clamping members, and means comprising a nut threaded onto the inner end of said threaded tension rod and coacting with said back clamping means to tension said rod.

31. A multi-angular corner clamp construction for clamping panels of glass or the like which are in substantially edge-to-edge relation and make an angle with each other comprising a threaded tension rod for passage through the panel junction and having a cup-shaped fulcrum member at its outer end and coaxially therewith with the open end of said cup-shaped member toward said panels and a diameter thereof 30 --substantially aligned :with said junction, said cup-shaped fulcrum :member having its rim on each side of said diameter cut away to provide two opposed concave fulcrum edges, two elongated front clamping members for engagement with the respective-front faces-of said two panels 'and hav'ing front sur'faoes which are convex and which seat respectively against said two opposed concave fulcrum edges with portions of the clamping members extending radially inward of the rim of the cup-shaped fulcrum member and toward said threaded tension rod, means comprising 'a nut threaded on said threaded rod and providing a face engageable with said portions -'of said front clamping members and operable to conjointly pivot said clamping members about said-concave fulcrum edges for substantially setting the angle between said two clamping members to the angle of said panels, back clamping means providing parts adapted to rest against the respective inside faces of said panels, each to one side "of said junction and respectively juxtaposed to said front clamping members, and

means "comprising a nut threaded onto the inner end of said threaded tension rod and coacting with said back clamping means to tension said rod.

.32. A multi-angular corner clamp construction as claimed in claim 16 in which said cupshaped fulcrum member has an outer end portion that is a portion of a sphere and terminates in a substantially flat'end wall, said flat end wall having a coaxial aperture therein and said threaded tension rod extending through said aperture and t'erminating'iin a head that has a flat inner face to rest against said flat end wall that has an outer face that is a portion of a spherical surface of the same radius as that of said cup-shapedfdlcrum member.

33. A niUlti-angular corner clamp construction as claimedin claim 32 in which said aperture in the end wall of the cup-shaped fulcrum member is semi-circular with its straight edge aligned with :said diameter of said cup-shaped fulcrum member, said threaded tension rod being half round in -cross section whereby said straight edge of said aperture aligns the flat face of the tension 'ro'd'wit'h said diameter and transversely of the line of said'two opposed'concave "fulcrum edges whereby, upon passage of the rod'through the panel junction, its flat face becomes aligned substantially with an edge face of one of said panels and thereby said opposed concave fulcrum edges and said convex front clamping members respectively seated therein are substantially aligned transversely of said panel junction.

34. A multi-angular corner clamp construction as claimed in claim 33 in which said face that engages said inwardly extending portions of said front clamping members comprises an external surface of a shell having an aperture in its bottom closely matching the cross section of said half-round threaded rod for passage of the latter therethrough and for holding said shell against rotation about the axis of said rod, said shell having a portion that provides a surface of revolution about the axis of said aperture in the bottom of the'shell and said nut having a surface of revolution interfitting with that of said shell for coacting to hold said nut and said half-round threaded rod against detrimental relative displacement out of substantially coaxial relation.

35. A multi-angular clamp construction for. 

